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Augmented Reality (AR) technology is a technology that combines virtual information with the real world. The technical means it uses include Multimedia, 3D-Modelling, Real-time Tracking and Registration, Intelligent Interaction, Sensing, and more. Its principle is to apply computer-generated virtual information, such as texts, images, 3D models, music, videos to the real world after simulation.

Augmented reality apps are written in special 3D programs that allow the developer to tie animation or contextual digital information in the computer program to an augmented reality "marker" in the real world. When a computing device's AR app or browser plug-in receives digital information from a known marker, it begins to execute the marker's code and layer the correct image or images.

AR applications for smartphones typically include a global positioning system (GPS) to pinpoint the user's location and its compass to detect device orientation. Sophisticated AR programs used by the military for training may include machine vision, object recognition, and gesture recognition technologies.

Taken from: whatis.techtarget.com and iopscience.iop.org

"..., it begins to execute the marker's code and layer the correct image or images" (Paragraph two).

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